question about NEXRAD

Hey Everyone..

I am still a bit confused about "what is what" with the FNEXRAD / NEXRAD 
/ NMC feeds..

I was wondering if someone can enlighten me on the difference between
doing the following:

For example, if I request:
request NNEXRAD ".*" 
request FNEXRAD ".*"
request NMC     ".*"

> From what I understand, FNEXRAD and NMC are the same, correct?

Also, I do not want all every station, just a few... but I would like to
receive the "intersting" areas when active weather is occuring there.. do
I then just do:

request FNEXRAD ".*"    ?

Thanks Everyone..

LDM Admin 
University of Michigan